U110D-LOST COMMUNICATION WITH SECURITY SIREN

For a complete wiring diagram Refer to Section 8W

When Monitored:
Continuously while the VTSS is armed.
Set Condition:
If the Intrusion Transceiver Module does not receive messages from the Siren.

Possible Causes

INTERMITTENT CONDITION

(A412) FUSED B+ CIRCUIT OPEN

(Z905) GROUND CIRCUIT OPEN

(D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO BATTERY

(D96) SIREN SIGNAL CONTROL CIRCUIT OPEN

(D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO GROUND

SIREN

INTRUSION TRANSCEIVER MODULE

Diagnostic Test

1. INTERMITTENT DTC

With the scan tool, erase the current Intrusion Transceiver Module DTC's.
Turn the ignition off.
Arm the VTSS and wait 1 minute.
Disarm the VTSS and turn the ignition on.
Using the scan tool, read ITM DTC(s).

Does the scan tool display the same DTC?

Yes

Go To 2

No

The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition. Look for any chafed, pierced, pinched or partially broken wires.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

2. (A412) FUSED B+ OPEN

Gain access to the VTSS Siren.
Disconnect the Siren connector.
Using a 12-volt test light connected to ground, check the (A412) Fused B(+) circuit in the Siren connector.

Does the test light illuminate brightly?

Yes

Go To 3

No

Repair the (A412) Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

3. (Z905) GROUND CIRCUIT OPEN

Using a 12-volt test light connected to 12-volts, check the (Z905) Ground circuit at the siren connector.

Does the test light illuminate brightly?

Yes

Go To 4

No

Repair the (Z905) Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

4. FAULTY SIREN

Use the DRBIII and set up as follows:
Use the Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.
Connect the scope input cable to the channel one connector on the DRBIII. Attach the red and black leads and the cable to probe adapter to the scope input cable.
Select DRBIII Stand-alone.
Select lab scope.
Select Live.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.
Disconnect the Siren connector.
Connect the black lead to the chassis ground. Connect the red lead to the (D96) Siren Signal Control circuit in the Siren connector.
Close all doors and arm the VTSS.
Observe the voltage displayed on the DRBIII Lab Scope.

Is there a voltage square wave present 1 to 2 seconds?

Yes

Connect a known good siren and try to reset the DTC. If the DTC does not reset the original siren needs to be replaced. If the DTC does reset replace the Intrusion Transceiver Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Go To 5

5. (D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO BATTERY

Disconnect the Siren harness connector.
Measure the voltage of the (D96) Siren Signal Control circuit.

Is there any voltage present?

Yes

Repair the (D96) Siren Signal Control circuit for a short to voltage.

Perform BODY VERIFICATION TEST - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Go To 6

6. (D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO GROUND

Disconnect the Siren harness connector.
Disconnect the Intrusion Transceiver Module harness connector.
Measure the resistance between ground and the (D96) Siren Signal Control circuit.

Is the resistance above 5.0 ohms?

Yes

Go To 7

No

Repair the (D96) Siren Signal Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

7. (D96) SIREN SIGNAL CONTROL CIRCUIT OPEN

Disconnect the Intrusion Transceiver Module harness connector.
Measure the resistance of the (D96) Siren Signal Control circuit between the Intrusion Transceiver Module and the Siren connector.

Is the resistance below 5.0 ohms?

Yes

Replace the Intrusion Transceiver Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

No

Repair the (D96) Siren Signal Control circuit for an open.
Perform BODY VERIFICATION TEST - VER1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)